Apartment building



FIG. 1 is a side elevational view of an apartment building showing our new design;

FIG. 2 is an end elevational view; and

FIG. 3 is a top plan view thereof;

The opposite side and end of the apartment building not shown in the drawings are identical to the side and end shown in FIGS. 1 and 2, respectively. 

The ornamental design for an apartment building, substantially as shown and described. 